Answer:
B. Must be appointed by the President and approved by Senate
Step-by-step explanation:
In the case of the appointment of the federal justices in the United States of America, there is a single requirement which could be found in the constitution.
This requirement is about the need for the Judge to be appointed by the President of US which would be confirmed and ratified by the US Senate. An example is the Supreme Court Judge recently appointed and approve by the Senate.